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A378723 as a triangular array

1
00
236
24612
24101215
346101215
34910121518
456910151820
46891012151824
5689101215182024
678910121415182428
67891014151820242830

A378723 as a square array

102223344566
03444456677
66106968888
1212101099999
1512121010101010
15151512121214
181815151415
2018181518
24201820
242424
2828
30
102223344566
03444456677
66106968888
1212101099999
1512121010101010
15151512121214
181815151415
2018181518
24201820
242424
2828
30